This is your typical isekai harem fantasy, but much much better :) You should know some litRPG and isekai tropes for the best experience. Shameless 5 stars for myself.

No.

Absolute trash advice, as expected by Chinese trash authors. Unbelievable that people give this more than 1 start. If you follow any "advice" from this your novel will end up as a terrible mess. Look for some real advice from good authors.